Question

What should be a best way to create key/value pairs for all the string instance variables of a class? Is there any library exists doing such a task?

I am doing the same using a reflection based backward look-up. But it seems doing to much work.

For example:

I have a class

public class Account implements ManagedEntity {

private String accountNumber;

public Account(String accountNumber) {
    this.accountNumber = accountNumber;
}
}

If an instance of Account class is created like blelow,
Account ac = new Account(“abc”);

The output map should be like: [{“accountNumber”, “abc”}].

Answer 1

As Peter Lawrey already pointed out in one of the comments, if you are looking for a library that can do that transformation for you then one possible answer is Apache Commons BeanUtils:

You could use the BeanUtils class from that library:

Account account = new Account("abc");
Map accountMap = new HashMap();
BeanUtils.populate(account, accountMap);

Or using the BeanMap implementation it would be even easier:

Account account = new Account("abc");
Map accountMap = new BeanMap(account);